Sugar is fine and dandy, but its nice to have the option to run something a little less… sweet. Unfortunately, with a 433mhz Geode and 256mb of RAM, its kind of a stretch to run a real desktop environment like Gnome or KDE on an XO, and even XFCE is a bit heavy. Luckily, with low powered UMPCs coming out in abundance, there is a lot of development going on for these kinds of devices. Ubuntu Mobile and Embedded Edition shows a lot of promise, as you get the massive number of packages available for Ubuntu in a distro designed for low power and small screens. So, this is a guide on installing and running Ubuntu Mobile on an SD card on an OLPC XO. Ubuntu Mobile is still very much alpha software and is designed for touchscreens, but it’s generally usable and quite speedy.